/* banner */
.banner {
  position: relative;
  overflow: auto;
}

.banner li {
  list-style: none;
}

.banner ul li {
  float: left;
}

/* 引导的小圆点 */
.banner .dots {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 20px;
  text-align: center;
}

.banner .dots li {
  display: inline-block;
  width: 10px;
  height: 10px;
  margin: 0 4px;
  text-indent: -999em;
  border: 2px solid #fff;
  border-radius: 6px;
  cursor: pointer;
  opacity: .4;
  -webkit-transition: background .5s, opacity .5s;
  -moz-transition: background .5s, opacity .5s;
  transition: background .5s, opacity .5s;
}

.banner .dots li.active {
  background: #fff;
  opacity: 1;
}